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OCC技術(shù)制備的單晶銅線材冷拔組織TEM分析
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國家自然科學(xué)基金（50771076, 50901055）；陜西省教育廳科研專項(xiàng)（07JK274）


TEM Analysis of Drawn Single Crystal Copper Wires Produced by OCC Method
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    摘要:

    采用TEM系統(tǒng)分析了OCC技術(shù)制備的單晶銅線材在冷拔過程中形成的位錯(cuò)胞、幾何必須界面以及孿晶，發(fā)現(xiàn)當(dāng)真應(yīng)變小于0.94時(shí)，冷拔單晶銅線材的微觀組織為位錯(cuò)胞。當(dāng)真應(yīng)變大于0.94時(shí)，其微觀組織主要包括位錯(cuò)胞和幾何必須界面兩類組織。其中位錯(cuò)胞沿冷拔方向拉長，橫界面上為等軸狀。隨變形量的增加，位錯(cuò)胞尺寸減小，當(dāng)真應(yīng)變大于1.39時(shí)，位錯(cuò)胞尺寸不再隨塑性變形量的增加而減小，其直徑保持在0.28 μm左右。當(dāng)變形量比較小時(shí)，兩類幾何必須位錯(cuò)界面屬于晶體學(xué)界面，當(dāng)變形量比較大時(shí)，幾何必須位錯(cuò)界面與冷拔方向平行。同時(shí)，分析還發(fā)現(xiàn)冷拔單晶銅線材中存在少量由凝固過程形成并遺傳到形變組織以及在冷拔過程直接形成的兩類孿晶。

    Abstract:

    Dislocation cells, geometrically necessary boundaries (GNB) and twins in drawn single crystal copper wires produced by Ohno continuous casting (OCC) method have been analyzed by TEM. The results show that when the strains are lower than 0.94, the microstructures of drawn single crystal can be characterized as dislocation cells. When the strains are more than 0.94, there are two kinds of microstructures. One is that dislocation cells are elongated in longitudinal section and equiaxed in cross section. The size of dislocation cells decreases as the strain increases until they reach a critical size of about 0.28 μm at a strain of 1.39. The other is geometrically necessary boundaries. At low strains, two kinds of geometrically necessary boundaries are along {111}, and at high strains, geometrically necessary boundaries are parallel to drawn direction. In addition, it is found that in dawn single crystal copper wires, there are two types of twins in the single crystal copper wires. One is formed in the preparing process of single crystal copper wires by Ohno continuous casting method, and the other is formed during cold drawing deformation.

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陳 建,嚴(yán) 文,苗 健,彭渝莉,范新會. OCC技術(shù)制備的單晶銅線材冷拔組織TEM分析[J].稀有金屬材料與工程,2011,40(10):1727~1731.[Chen Jian, Yan Wen, Miao Jian, Peng Yuli, Fan Xinhui. TEM Analysis of Drawn Single Crystal Copper Wires Produced by OCC Method[J]. Rare Metal Materials and Engineering,2011,40(10):1727~1731.]
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  • 收稿日期:2010-10-25
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